This article was from a month ago but I just ran across it. Though it was in reference to the Mark Hurd ouster, the takeaways are universal.

Power is an interesting thing. It’s lovely to think that you could make this enormous impact on the world for the better, but at some point it detracts from your decision-making, relationships, and eventually, your quality of life. It suggests that perhaps we should manage the level of power we attain and purposefully institute handoffs and controls.

Excerpts:

"Psychologists refer to this as the paradox of power. The very traits that helped leaders accumulate control in the first place all but disappear once they rise to power. Instead of being polite, honest and outgoing, they become impulsive, reckless and rude. In some cases, these new habits can help a leader be more decisive and single-minded, or more likely to make choices that will be profitable regardless of their popularity. One recent study found that overconfident CEOs were more likely to pursue innovation and take their companies in new technological directions. Unchecked, however, these instincts can lead to a big fall."

..

"According to the survey, the students at the top of the social hierarchy—they were the most "powerful" and respected—were also the most considerate and outgoing, and scored highest on measures of agreeableness and extroversion. In other words, the nice guys finished first.

This result isn't unique to Berkeley undergrads. Other studies have found similar results in the military, corporations and politics. "People give authority to people that they genuinely like," says Mr. Keltner.

Of course, these scientific findings contradict the cliché of power, which is that the only way to rise to the top is to engage in self-serving and morally dubious behavior. In "The Prince," a treatise on the art of politics, the 16th century Italian philosopher Niccolo Machiavelli insisted that compassion got in the way of eminence. If a leader has to choose between being feared or being loved, Machiavelli insisted that the leader should always go with fear."

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"While a little compassion might help us climb the social ladder, once we're at the top we end up morphing into a very different kind of beast.

"It's an incredibly consistent effect," Mr. Keltner says. "When you give people power, they basically start acting like fools. They flirt inappropriately, tease in a hostile fashion, and become totally impulsive." Mr. Keltner compares the feeling of power to brain damage, noting that people with lots of authority tend to behave like neurological patients with a damaged orbito-frontal lobe, a brain area that's crucial for empathy and decision-making. Even the most virtuous people can be undone by the corner office."

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"According to psychologists, one of the main problems with authority is that it makes us less sympathetic to the concerns and emotions of others. For instance, several studies have found that people in positions of authority are more likely to rely on stereotypes and generalizations when judging other people. They also spend much less time making eye contact, at least when a person without power is talking.

Consider a recent study led by Adam Galinsky, a psychologist at Northwestern University. Mr. Galinsky and colleagues began by asking subjects to either describe an experience in which they had lots of power or a time when they felt utterly powerless. Then the psychologists asked the subjects to draw the letter E on their foreheads. Those primed with feelings of power were much more likely to draw the letter backwards, at least when seen by another person. Mr. Galinsky argues that this effect is triggered by the myopia of power, which makes it much harder to imagine the world from the perspective of someone else. We draw the letter backwards because we don't care about the viewpoint of others."

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"Although people almost always know the right thing to do—cheating is wrong—their sense of power makes it easier to rationalize away the ethical lapse. For instance, when the psychologists asked the subjects (in both low- and high-power conditions) how they would judge an individual who drove too fast when late for an appointment, people in the high-power group consistently said it was worse when others committed those crimes than when they did themselves. In other words, the feeling of eminence led people to conclude that they had a good reason for speeding—they're important people, with important things to do—but that everyone else should follow the posted signs."

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"This suggests that even fleeting feelings of power can dramatically change the way people respond to information. Instead of analyzing the strength of the argument, those with authority focus on whether or not the argument confirms what they already believe. If it doesn't, then the facts are conveniently ignored."

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"Mr. Keltner argues that the best treatment is transparency, and that the worst abuses of power can be prevented when people know they're being monitored. This suggests that the mere existence of a regulatory watchdog or an active board of directors can help discourage people from doing bad things.

However, people in power tend to reliably overestimate their moral virtue, which leads them to stifle oversight. They lobby against regulators, and fill corporate boards with their friends."